Show:
Magnets
Electromagnets
Static Electricity
Electric Circuits
Motors and Generators
100
What are three main types of magnets.
Permanent magnets, Temporary magnets, and electromagnets
100
What is an electromagnet?
A coil of wire wrapped around an iron nail.
100
What is static electricity?
It is a build up of electrical charges on an object.
100
What is electric current?
A flow of electric charges is known as an electric current.
100
What is an electric motor?
An electric motor is a device that changes electrical energy into mechanical energy.
200
What happens when a magnet is brought near an iron nail?
The nail becomes magnetic.
200
How can you make the electromagnet's magnetic field stronger?
Wrap more coils of wire around the iron nail.
200
What is a discharge?
A discharge is the movement of static electricity from one object to another.
200
What is an electric circuit?
The path along which electric current flows is called a circuit.
200
What is a generator?
A generator turns motion into electrical energy.
300
What would you detect by using a compass, iron filings, and iron objects?
Magnetic Fields
300
Name at least 2 devices in which electromagnets are used?
Loud speaker and a microphone.
300
Give one example of a discharge.
Lightning is the discharge of static electricity inside a storm cloud.
300
What is a series circuit?
In a series circuit, all the electric charges flow in the same direction along one path.
300
What causes the wires in a generator to spin?
Electrical energy
400
What are naturally occurring magnets in nature called?
Lodestones
400
What advantage does an electromagnet have over a permanent magnet?
An electromagnet can be switched off when not needed.
400
What is a conductor? Give 2 examples.
Conductor is a material that lets charges flow through it easily. Examples are copper and water.
400
What is a parallel circuit?
In a parallel circuit, the electric charges flow through more than one path.
400
What is an alternating current and a direct current?
An alternating current flows in one direction and then flows in the opposite direction. A direct current always flows in one direction.
500
Are magnets stronger than gravity?
No, Gravity is stronger.
500
If you hang a magnet so it is free to swing and turn, what have you created?
A compass.
500
What is an insulator? Give 2 examples.
Insulator is a material that does not let charges flow through it easily. Examples are plastic and rubber.
500
What is a voltage and a resistance?
Voltage is the strength of a power source. Resistance is the ability of a substance to oppose or slow down electric current.
500
The electric current produced by a battery is an example of ..
Direct current